Drum printer



Dec. 13, 1966 c. H. CLARK ETAL DRUM PRINTER 2O Sheets-Sheebl Filed Oct. 25, 1962 INVENTORS CLA YTON H. C1. ARK

#9 ma mw 07 om r DONALD J. 57'EFAN/K MM, 7201/42/20 9 M ATTORNEYS R 2 sq Dec. 13, 1966 c. H. CLARK ETAL 3,

DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-Sheet 3 INVENTORS CLAYTON H. CLARK DONALD JSTEfiAN/K 1966 c. H. CLARK ETAL 3,

DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-Sheet 4 CLAYTON H. CLARK DONALD J. TEFANIK ATTORNEYS Dec. 13, 1966 c. H. CLARK ETAL DRUM PRINTER 2O Sheets-Sheet 5 Filed Oct. 25, 1962 INVENTORS CLAYTON H. CLARK DONALD J. STEFAN/K ATTORNEYS Dec. 13, 1966 c. H. CLARK ETAL DRUM PRINTER 20 Sheets-Sheet 6 Filed Oct. 25, 1962 ATTORNEYS Dec. 13, 1966 c. H. CLARK ETAL 3,291,909

DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-$heet 7 CLAYTON H. CLARK DONALD J STEFAN/K BY ,Jzz uc, MW 9 ATTORNEYS n-zsq Dec. 1966 c. H. CLARK ETAL 3,291,909

DRUM PRINTER Filed Oct. 25, 1962 20 SheetsSheet 9 INVENTORS LAYTON H CLARK 410-2 DONALD J. STEFAN/K BY m, mm

ATTORNEYS DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-$heet 10 it 2Hommer 424 422 INVENTORS CLAYTON H. CLARK DONALD J. 5TEFAN/K 41 I Hammer 67 ATTORNEYS R-Z59 Dec. 13, 1966 c, H, CLARK ETAL 3,291,909

DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-Sheet l1 MAIN CLOCK INDEX CLOCK FlnsY REGISTER COMPARATOR Rims-1:: GROUP 2 mzusvsn ROLF INFDRMAYION REGISTER 5120a: SET RtiusTzQ INVENTORS CLAYT o/v H. CLARK BY DONALD J JTEFAN/K Dec. 13, 1966 DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-Sheet l8 a mu 5 f. man} GI FET ,.:=i -4 s23 r1 L Q51 I Fri 6 30R 2 5:1 2:1

3 1 J NWT INNIBIY GAYE NM -v 7 E2511 M1916 NOR S j RESE Y B T PRINT DELAY a I CRQO RIBBON LIF'Y AMPLIFIER INVENTORS CLAYTON H. CLARK BY DONALD J STEFAN/K 15M, MSLM ATTORIyEYS Dec. 13, 1966 Filed Oct. 25, 1962 RESISTOR NOR GATE C. H. CLARK ETAL DRUM PRINTER 20 Sheets-Sheet 15 ya: I A r 5 EM|T ER FOLLOWER A cm I AA 5 CR2 B T C en:

A a c 1 o o o O I D O o o o v 1 o i o I o 0 f1 -5 AND GATE 1 cu m 2 m c3 R2 A a c T o o o o a o o o o a o o I a 0 fi I I n TNVENTORS CLAYTON H. CLARK BY DONALD J. STEFAN/K A TTORNEYS Dec. 13, 1966 c. H. CLARK ETAL DRUM PRINTER t z oo e 2 o I 0 0 l O O h 0 0 I 0 2 1 u n n u R u COUNTER ONE SHOT AND DRIVER ONE-SHOT EMlT'TER FOLLOWER AND DRIVER FREE-RUNNING MULTIVIBRATOR NOTES 1: NEGAYIVE vouno: LEVEL 0 o VOLTAGE LEVEL 2. A N0 OUTPUT D PULSE PRODUCED BY A TRANSIT'ON FROM I TO 0.

V OUYPUT LEVEL IS 0? ADJUSTQBLE LENGTH.

TIME DELAY JW, 7245mm M R457 4 TTOR/VEYS Dec. 13, 1966 3,291,909

c. H. CLARK ETAL DRUM PRINTER Filed Oct. 25, 1962 20 sh eetsw-Sheet l5 COMPARATOR REGISTERS 2V COMPARATOR COUNTER 'I CREC I I'IZVCCL .J NI i I I- I. I FROM CLOCK v CIRCUIT FROM 2V INDEX STROBE SET 52o CLOCK REGISTER 5I6 COINCIDENCE GATE FROM RESET FROM sTROBE Q30 REGISTER 5|8 TO PRINT CONTROL CIRCUITS COINCIDENCE REG. 540

AND FUNCTION GATES AND 9-ANDI4 INVENTORS CLAYTON CLARK DONALD J STEFAN/K BY KEFM,7ZJ&ZWM

FIT-.- 7-4.

Dec. 13, 1966 I c. H. CLARK ETAL 3,291,909

DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-Sheet 18 AND I8 CH D 02 NJ l.- 2

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Dec. 13, 1966 c. H. CLARK ETAL DRUM PRINTER Filed Oct. 25, 1962 PRINT 2 PRINT DETEC.2

SPACE CASE REGISTER MPLI FIER 4 AM PLI. 2

20 Sheets-Sheet 19 INVENTOR CLAYTON H. CLARK DONALD J STEFAN/K RESET GATE SOR l 22 M, MQ M 1966 c. H. CLARK ETAL 3,291,909

DRUM PRINTER Filed Oct. 25, 1962 20 Sheets-$heet 20 CI CRI G A--{ 2 QI 9 FII Q (:2 CR2 D Q2 R2 +V A B C D 6 Q [I I o I El 0 I O D I 0 [I O I 0 NOTE? MEANS AN INHIBIT CIRCUIT FORTHE ASSOCIATED INPUT TO THE SOR GATE SPECIAL OR GATE (SOR) WITH A REGISTER INVENTORS CLAYTON H. CLARK .Da/VALD J. STEFAN/K BY 5 W,

ATTORNEYS 

1. A PAGE PRINTER, HAVING CODE SIGNAL RECEIVING AND PRINTER CONTROL AND OPERATING MEANS AND WHEREIN PRINTING MEANS INCLUDE A PRINT HAMMER CARRIAGE MEANS WHICH MOVES IN SPACING STEPS AND RETURN MOVEMENT ACROSS A PAGE, COMPRISING: (A) MEANS INCLUDING A POWER STORAGE SPRING MEANS FOR STEP SPACING SAID CARRIAGE MEANS FROM A START-OF-LINE POSITION TO AN END-OF-LINE POSITION, SAID SPRING MEANS SUPPLYING THE FORCE FOR CARRIAGE STEPPING MOVEMENT; (B) A POSITIVE DRIVE CARRIAGE RETURN MECHANISM INCLUDING: (1) AN ELECTRO-MAGNETIC CLUTCH MEANS, ENERGIZABLE FOR ACCOMPLISHING POSITIVE DRIVE ACTUATION; (2) CARRIAGE RETURN CONTROL MEANS OPERABLE IN RESPONSE TO A CARRIAGE RETURN SIGNAL TO AUTOMATICALLY ENERGIZE SAID MAGNETIC CLUTCH AND TO CONCURRENTLY SHIFT AND MAINTAIN THE MEANS FOR STEP SPACING SAID CARRIAGE MEANS IN AN INACTIVE POSITION DURING RETURN MOVEMENT OF SAID CARRIAGE MEANS TO A START-OF-LINE POSITION, SAID RETURN OPERATION STORING POWER IN SAID SPRING MEANS FOR SUBSEQUENT STEP SPACING ACTIONS; AND (3) ADDITIONAL CONTROL MEANS TO AUTOMATICALLY DEENERGIZE SAID CARRIAGE RETURN CLUTCH ELECTRO-MAGNET AND TO PERMIT ACTIVATION OF SAID MEANS FOR STEP SPACING SAID CARRIAGE MEANS WHEN SAID CARRIAGE MEANS REACHES ITS START-OF-LINE POSITION. 